Using QHttpMultiPart with QHttpPart Binary and Form Data - qt

Question

I wrote a method to send a image and some form data to a Django Rest Framework Server. The following method works fine, but I would like to know if there is a way to send the form fields together in one QHttpPart, instead of creating one for each field?
Is there a better way to do this? Maybe with less code?
void MyNetwork::sendBinaryFile() {
QNetworkAccessManager *manager = new QNetworkAccessManager(this);
connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyfinished(QNetworkReply*)));
QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
QHttpPart aluno, palavra_chave, latitude, latitude_ref, longitude, longitude_ref;
aluno.setHeader(QNetworkRequest::ContentDispositionHeader,QVariant("form-data; name=\"aluno\""));
aluno.setBody("some useful string");
palavra_chave.setHeader(QNetworkRequest::ContentDispositionHeader,QVariant("form-data; name=\"palavra_chave\""));
palavra_chave.setBody("some other useful string");
latitude.setHeader(QNetworkRequest::ContentDispositionHeader,QVariant("form-data; name=\"latitude\""));
latitude.setBody("0");
longitude.setHeader(QNetworkRequest::ContentDispositionHeader,QVariant("form-data; name=\"longitude\""));
longitude.setBody("0");
latitude_ref.setHeader(QNetworkRequest::ContentDispositionHeader,QVariant("form-data; name=\"latitude_ref\""));
latitude_ref.setBody("N");
longitude_ref.setHeader(QNetworkRequest::ContentDispositionHeader,QVariant("form-data; name=\"longitude_ref\""));
longitude_ref.setBody("E");
multiPart->append(aluno);
multiPart->append(palavra_chave);
multiPart->append(latitude);
multiPart->append(latitude_ref);
multiPart->append(longitude);
multiPart->append(longitude_ref);
QHttpPart imagePart;
imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/png"));
imagePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; filename=\"image.png\"; name=\"file\""));
QFile *file = new QFile("/path/image.png");
file->open(QIODevice::ReadOnly);
imagePart.setBodyDevice(file);
file->setParent(multiPart);
multiPart->append(imagePart);
QString sendPath = "http://localhost/api/images/";
QUrl url(sendPath);
QNetworkRequest request(url);
QString concatenated = "username:password";
QByteArray data = "Basic ";
data.append(concatenated.toLocal8Bit().toBase64());
request.setRawHeader("Authorization", data);
manager->post(request,multiPart);
}
void MyNetwork::replyfinished(QNetworkReply* reply)
{
qDebug() << "C++ - replyUpdateJsonFinished";
qDebug() << QString(reply->readAll());
qDebug() << QString(reply->errorString());
}

Answer 1

Because of the nature of multipart/form-data, each field that is sent must be sent in a different part. This is because each part in the request represents a different field, and is identified by the field name and contains the body that should be sent (in your case, mostly text).
You may have better luck creating a helper method for the text field that takes the field name and the content of it. That method would then be able to create a new part with the correct header (containing the field name) and the body (containing the data to send), without requiring you to repeat the same lines.